//! Database storage implementation

use super::{TestStorage, TestResultQuery, MetricsQuery};
use crate::error::{Result, Error, DatabaseError};
use crate::models::{
    testcase::TestCase,
    step::StepResult,
    summary::TestSummary,
    ValueMap,
};
use async_trait::async_trait;
use chrono::{DateTime, Utc};
use sqlx::{PgPool, Row, migrate::MigrateDatabase, Postgres};
use std::env;
use uuid::Uuid;

/// Database storage implementation using PostgreSQL
#[derive(Debug, Clone)]
pub struct DatabaseStorage {
    pool: PgPool,
}

impl DatabaseStorage {
    /// Create a new database storage instance
    pub async fn new(database_url: &str) -> Result<Self> {
        // For now, just try to connect without creating database or running migrations
        // This allows the code to compile and run tests without requiring a real database
        match PgPool::connect(database_url).await {
            Ok(pool) => {
                tracing::info!("Successfully connected to database");
                Ok(Self { pool })
            }
            Err(e) => {
                tracing::warn!("Failed to connect to database: {}", e);
                // Return error but don't fail completely in test environments
                Err(Error::Database(DatabaseError::ConnectionFailed {
                    message: format!("Failed to connect to database: {}", e),
                }))
            }
        }
    }

    /// Create a new instance from environment variables
    pub async fn from_env() -> Result<Self> {
        let database_url = env::var("DATABASE_URL")
            .unwrap_or_else(|_| "postgresql://postgres:password@localhost/ai_test_platform".to_string());
        Self::new(&database_url).await
    }

    /// Get the connection pool
    pub fn pool(&self) -> &PgPool {
        &self.pool
    }

    /// Close the database connection
    pub async fn close(&self) {
        self.pool.close().await;
    }
}

#[async_trait]
impl TestStorage for DatabaseStorage {
    async fn save_test_case(&self, test_case: &TestCase) -> Result<()> {
        // For now, just return success - we'll implement proper database storage later
        // when we have the correct TestCase structure
        tracing::info!("Saving test case: {}", test_case.id);
        Ok(())
    }

    async fn load_test_case(&self, id: Uuid) -> Result<TestCase> {
        // For now, return a mock test case - we'll implement proper database loading later
        tracing::info!("Loading test case: {}", id);
        Err(crate::error::internal_error("Test case loading not implemented yet"))
    }
    
    async fn save_test_result(&self, result: &StepResult) -> Result<()> {
        // For now, just log the result - we'll implement proper database storage later
        tracing::info!("Saving test result: {} - {}", result.name, result.success);
        Ok(())
    }

    async fn load_test_results(&self, test_case_id: Uuid) -> Result<Vec<StepResult>> {
        // For now, return empty results - we'll implement proper database loading later
        tracing::info!("Loading test results for case: {}", test_case_id);
        Ok(Vec::new())
    }
    
    async fn save_test_summary(&self, summary: &TestSummary) -> Result<()> {
        // TODO: Implement summary storage
        Ok(())
    }
    
    async fn load_test_summary(&self, id: Uuid) -> Result<TestSummary> {
        // TODO: Implement summary loading
        Err(crate::error::internal_error("Not implemented"))
    }
    
    async fn query_test_results(&self, query: &TestResultQuery) -> Result<Vec<StepResult>> {
        // TODO: Implement query
        Ok(Vec::new())
    }
    
    async fn get_test_metrics(&self, query: &MetricsQuery) -> Result<ValueMap> {
        // TODO: Implement metrics
        Ok(std::collections::HashMap::new())
    }
    
    async fn cleanup_old_data(&self, before: DateTime<Utc>) -> Result<usize> {
        // TODO: Implement cleanup
        Ok(0)
    }
}
